Monday 18 May 2015

Weather Instrument pt. 2

The Wind Vane
Wind Vane

A wind vane, also known as a weather vane, is a tool used to determine the direction of the wind. Wind direction is direction from which the wind is blowing. They are often attached to the tops of buildings, where the wind isn't interrupted by objects lower to the ground. The wind vane has short arms representing the cardinal points and pointer.
The Rain Gauge

Rain Gauge

A rain gauge us a weather instrument used to measure the amount of rainfall in millimeters. A rain gauge consists of a funnel leading to a measuring tube. The rim of the funnel is about 30cm above the level of the ground to prevent water from splashing onto it. The rain gauge must not be placed under trees or building so as to prevent excess water from entering.

The Hygrometer


 A hygrometer is an instrument used for measuring humidity of the atmosphere. It can indicate relative humidity (the percentage of moisture in the air), absolute humidity (the amount of moisture), or both. Some hygrometer will simply tell whether the air is dry or damp. An important use of hygrometers is in weather forecasting. It measures different ranges of humidity depending on the model.

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